Memory System

The memory system is able to store and recall the driver side power seat positions (including the power recliner position), power adjustable pedal positions and the driver outside mirror position for two drivers. On vehicles equipped with a factory radio, the memory system is also able to store and recall radio station presets for two drivers. The memory system also will store and recall the last station listened to for each driver, even if it is not one of the preset stations.

The memory system will automatically return to its preset settings when the corresponding numbered button of the memory switch is depressed, or when the doors are unlocked using the corresponding Remote Keyless Entry (RKE) transmitter. A customer programmable feature of the memory system allows the RKE recall of memory features to be disabled, if desired. This programmable feature is internal in the Electronic Vehicle Information Center (EVIC) module, which is located in the overhead console.

A Memory Seat Mirror Module (MSMM) is used to control and integrate the many electronic functions and features included in the memory seat and mirror systems.

The memory system includes the following components:
- Memory Seat Mirror Module (MSMM)
- Memory set switch
- Position potentiometers on the driver outside side view mirror
- Position potentiometers on the power adjustable pedal motor
- Position potentiometers on the driver side power seat track and power seat recliner motors
- Electronic Vehicle Information Center (EVIC)
- Radio receiver (if PCI data bus capable) Certain functions of the memory system rely upon resources shared with other electronic modules in the vehicle over the Programmable Communications Interface (PCI) data bus network. Initial diagnosis of these electronic modules or the PCI data bus network requires the use of a DRBIII (R) or equivalent scan tool and the proper Diagnostic Procedures information. If this method does not prove conclusive, the proper wiring schematics and the diagnostic information are required.

The other electronic modules that may affect memory system operation are:
- Body Control Module (BCM).
- Powertrain Control Module (PCM).
- Transmission Control Module (TCM).

The Memory Seat Mirror Module (MSMM) receives battery current through fuse #22 in the Integrated Power Module (IPM) and the power seat system circuit breaker, located under the driver side front seat near the rear edge of the seat cushion pan. The memory system does not operate with the Ignition-Off Draw (IOD) fuse removed. The MSMM will drive a maximum of 2 motors at a time in a given direction. If conflicting directions are requested, the priority for response will be approximately as follows:
- Seat Track Rearward or Forward
- Seat Front Down or Up
- Seat Rear Down or Up
- Recliner Rearward or Forward

The inputs from these switches to the MSMM is a current limited battery source fed by the MSMM. This protects the MSMM printed circuit board traces from acting as fuses. All of these switch contact inputs to the MSMM are normally closed to ground, except when actuated.

For diagnosis of the MSMM, the Programmable Communication Interface (PCI) data bus, or the other electronic modules on the PCI data bus that provide inputs and outputs for the memory system, the use of a DRBIII (R) or equivalent scan tool and the proper Diagnostic Procedures information is recommended.